Guide to 3.2 Level 3 Success Criterion 2

Techniques for addressing 3.2 L3 SC2

Some options deemed sufficient by the working group

For auto-refreshing content:

• Option 1:
  Providing a mechanism to request an update of the content instead of updating automatically.

For automatic redirects:

• Option 1:
  Implementing automatic redirects on the server side instead of on the client side.

For pop-up windows:

• Option 1:
  Providing a mechanism to open a new window instead of opening a pop-up window and changing the current window without informing the user.

Technology-Independent techniques for Guideline 3.2 L3 SC2

• Providing a mechanism to request an update of the content instead of updating automatically.
• Implementing automatic redirects on the server side instead of on the client side.
• Providing a mechanism to open a new window instead of opening a pop-up window and changing the current window without informing the user.

Technology-Specific Techniques for Guideline 3.2 L3 SC2

HTML Techniques

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Client-Side Scripting Techniques

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Server-Side Scripting Techniques

Provide automatic redirects by …

• using a server-side redirect that sends the HTTP message 301 (Moved Permanently) or 307 (Temporary Redirect) to the browser.

Optional Techniques (advisory) for 3.2 L3 SC2

Additional Technology-Independent Techniques

If you cannot use server-side redirects, implement automatic redirects by …

• using a client-side redirect that has no timeout and that does not break the user agent's backward navigation.

HTML Techniques

If you cannot use server-side redirects, implement automatic redirects by …

• using Meta redirect without a timeout.

Client-Side Scripting Techniques

• Not using the onblur event to change the context.
• Not opening pop-up windows that are not requested by the user.

Benefits: How 3.2 L3 SC2 helps people with disabilities

• Individuals who are unable to detect changes of context or may not realize that the context has changed are less likely to become disoriented while navigating a site. This applies to people in the following ways:

  • Individuals who are blind or have low vision may have difficulty knowing when a visual context change, such as a new window popping up, has occurred. In this case, warning users of context changes in advance minimizes confusion when the user discovers that the back button no longer behaves as expected.

• Some individuals with low vision, with dyslexia and who have difficulty interpreting visual cues may benefit from additional cues in order to detect changes of context.

• Changes of context that are not initiated by a user action can be very irritating for people without disabilities.

Examples of 3.2 L3 SC2

1. A drop-down list in a form that does not load a new document when the user selects an option without submitting the choice.
2. An "Update now" link or button on a web page.
3. An automatic redirect that is completely transparent to the user.

Related resources

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